Micrometer caliper



July 3, 1923.

J. W. PARKER MICROMETEH CALIPER Filed Marci 1 1s 1922 2 Sheets-Sheet 2 m MH INVENTOR.

Patented July 3, I923.

retinas earner; critics-- JOHN W. PARKER, 01? BARBINGTON, RHODE ISLAND, ASSIG-NOR TO BROWN & SHARPE MANUFACTURING COMPANY, OF PROVIDENCE, RHODE ISLAND.

MICROMETEE CALIPER.

Application filed March 15, 1922. Serial No. 543,981.

To all whom it may concern:

Be it known that I, JOHN W. PARKER, a citizen of the United States, residing at Barrington, in thecounty of Bristol and State of Rhode Island, have invented new and useful Improvements in Micrometer Calipers, of which the following is a specification.

This invention relates to certain new and useful improvements in micrometer calipers and the primary object thereof is to provide improved means for adjusting the micrometer spindle.

' Through constant use the end of the spindle or the anvil becomes worn, necessitatingresurfacing. which latter destroys the adjustment in that the two zero marks will not aline. It is therefore necessary to either adjust the spindle or the anvil, and where the latter is fixed, the adjustment therefore devolves upon the spindle. i V

The invention therefore aims to provide means of an improved character for correcting the spindle setting and for also taking up wear as the latter occurs on the threads of the spindle, and for also providing a single means for the performance of both functions.

The invention further aims to provide means which can be adjusted and loclred to obtain correct reading, without removal of the spindle.

The invention still further aims to provide means for attaining the above objects in a simple. practicalfand effective manner. and to also provide a more convenient and expeditious manner of correcting the spindle setting.

In the drawings: I

Figure 1 is a side elevation;

Figure 2 is an enlarged similar view, partly broken and in section to show the invention;

Figure 3 is an enlarged section on line 3-3 of Figure 2;

Figure 4 is a similar view on line 44 of Figure 2;

Figure 5 is a similar view on line 5-5 of Figure 4;

Figure 6 is a side elevation of the adjusting sleeve, and

Figure 7 is a rear end elevation of Fig ure 6.

In proceeding in accordance with the present invention, the drawings show a micrometer having a frame 1 with a fined anv11 2, an adjustable spindle 3, a barrel 4,

and a sleeve or thimble .5, the latter having the outer end of the spindle 3 attached thereto, as usual. The barrel 4 is internally threaded at 6, the latter threads being formed on the outer end part of the barrel, which latter is of increased internal diameter so as to accommodate the inner end '7 of the adjusting sleeve 8, the end 7 be ing externally threaded into engagement with the threads 6 of the barrel. The opposite end 9 of the sleeve 8 has interior threadswhich are-threaded into engagement with the threads of the spindle. Between its ends 8 and 9. the sleeve is formed with a peripheral collar 10 provided with slots 11 so as to enable the collar to be engaged by a wrench and the sleeve thereby turned to be accordingly adjusted. As depicted in Figure 6 of the drawings the end 9 of the sleeve 8 is of somewhat conical or tapered form and is exteriorly threaded and engaged with an encircling nut 13, the outer end part of the sleeve being split or formed with a series of longitudinal slots 12, sothat by moving the nut 13 toward the collar 10, the

threads on the interior of the end 9 of sleeve 0 0 will be caused to be drawn into close engagement with the threads of the spindle as wearon the latter threads occur. In this manner it will be seen that wear on the spindle threads can be adjusted as desired by mere turning of the nut 13, the latter having wrench engaging cut-outs .141 for the purpose of turning the nut. In this adjustment it will be seen that the slots 12 enable the parts intermediate the same to freely move toward the threads of the spindie and thereby engage the latter, due to the tapered threads on the part 9 and the nut 13 which has a corresponding taper. Mounted on .the exterior threads of the end 7 of the sleeve 8 is a stop nut 15 which latter has wrench engaging cut-outs 16, the

stop or lock-nut 15 abutting the outer end of the barrel 4 as depicted in Figure 2 of the drawings, the nut acting to fixedly hold the sleeve in adjusted position.

From the foregoing it will be seen that in order to bring the two zero marks of Figure 1 into register or alinement following resurfacing or refinishing of the free end of the spindle. the spindle is rotated so as to expose the lock nut 15 and the collar 10, whereupon nut 15 is released and collar 10 used to turn the sleeve 8 to effect the desired adjustment, and upon attainment of the .latter, the lock nut 15 is again tightened. In this operation, it will be seen that it is not necessary to completely remove the spindle. Upon wear of the threads on the spindle, the nut 13 is moved to ride up on the tapered threads of the end 9 of the sleeve, so as to force the interior threads of the end 9 into engagement with the threads of: the spindle 3. It will thus be seen that the sleeve 8 functions in a dual manner, namely to effect adjustment of the spindle. and to also provide for compensation of the wear of the threads of the spindle,

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1. In a micrometer caliper having a threaded spindle and a barrel having interior threads, a sleeve interiorly threaded to engage the threads of the spindle and having exterior threads on each end; the exterior threads on the. inner end of the sleeve engaging the threads of the barrel, a collar rigid on the sleeve between its ends to rotate the sleeve, a lock nut on the threads on the inner end of the sleeve abutting the outer end oi the barrel, the outer end of the sleeve having longitudinal spaced slots and the exterior threads of said outer end of the sleeve being tapered, and a compensating nut on the ta pered threads on the outer end of the sleeve for moving the interior threads 01 said outer end of the sleeve into engagement with the spindle threads upon wear of the latter.

2. In a micrometer caliper, having a threaded spindle and the barrel having interior threads, a sleeve threaded over the spindle threads and threaded into engage ment with the barrel, a member rigid on r the sleeve to effect turning thereof, a lock nut on the sleeve abutting the outer end of the barrel, the outer end of the sleeve having spaced longitudinal slots, and a nut on the outer end of the sleeve for forcing the threads of the slotted part thereof into engagement with the spindle threads.

3. In a micrometer caliper having a threaded spindle, a sleeve threaded on the spindle, means to eil'ect adjustment of the sleeve to correct the spindle setting, and means to effect adjustmentof the sleeve relative to the spindle threads, upon wear of the latter.

4-. In a micrometer caliper having a threaded. spindle and a barrel, combined means completely located within the barrel and disposed on the spindle for correcting the spindle setting and for taking up the wear on the spindle threads.

5. In a micrometer caliper having a threaded spindle and a barrel, combined means completely located within the barrel and disposed on the spindle for correcting the spindle setting and for taking up the wear on the spindle threads, without removing the spindle.

6. In a micrometer caliper having a threaded spindle, a sleeve having external and internal threads mounted on the spindle threads for longitudinal adjustment thereon to provide for a correct setting of the spin .dle, a lock nut to hold the sleeve in adjusted position, the sleeve having a split end with taper threads, and a nut mounted on the taper threads.

7. ln a micrometer caliper having a threaded spindle, a sleeve thereon, and means "for adjusting the sleeve for correcting the spindle setting without removing the spindle.

8. in a micrometer caliper having a barrel and a threaded spindle thereon, unitary means in threaded engagement with the spindle for correcting the spindle setting and for taking up ,wear on the spindle threads, means for adjustably securing said first named means in fixed relation to the barrel, and means for adjustabl securing said first named means to the spindle threads.

In testimony whereof I have signed my name to this specification in the presence oi two subscribing witnesses.

JOHN iv. PARKER. Witnesses:

M. A. Kmesmr, J. A. Mnmnn,

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